From the Benchmarks Wiki page: Benchmarks are extremely important when making infrastructure and configuration changes. The Raspberry Pi is by no means

From the Benchmarks Wiki page: Benchmarks are extremely important when making infrastructure and configuration changes. The Raspberry Pi is by no means a 'high performance' computer, but even with it's power-starved architecture, we can optimize many different parts of the stack to make the Pi perform well. I've been hosting www.pidramble.com on a cluster of 6 Raspberry Pi 2s with an Nginx load balancer, 4 Nginx + PHP web servers, and one MySQL database server for about 6 months, with two periods of downtime when I had to switch off the circuit in my office for some electrical work. The Pi 2 isn't a speed demon, but it's actually not so bad for a casual on-premise hosting solution, especially if you add in better failover modes. I'm going to be moving the architecture that direction for a presentation I'll be giving at php[tek] this summer.